A 28-year-old woman delivers vaginally after an uncomplicated labour. Thirty minutes later she has continued vaginal bleeding estimated at 900 mL. The uterus feels boggy on palpation. What is the most appropriate initial management?AUterine massage and intravenous oxytocinBObserve; this is normal postpartum lochiaCStart high-dose oral iron therapy onlyDImmediate laparotomy without further assessmentEPack the vagina and ignore uterine toneCheck my answer